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    計算機與數字工程

    計算機與數字工程

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    Computer and Digital Engineering
    《計算機與數字工程》雜志是中國科技核心期刊，目前已被中國期刊網，中國學術期刊（光盤版）全文收錄，成為中國學術期刊綜合評價數據庫來源期刊和科學引文數據庫（SCD）來源期刊；同時還被《中文科技期刊數據庫》全文收錄，并在"萬方數據—數字化期刊群"全文上網。?
    • 發文量：10057
    • 被引量：1638
    • H指數：1
    • 開始收錄時間：1989,17(1)
    • CNKI綜合因子：0.375
    • 維普期刊影響因子： 0.64
    • 萬方期刊影響因子：0.41
    • 創刊時間：1973
    • 國內刊號/CN：42-1372/TP
      國際刊號/ISSN：1672-9722
    • 發行周期：月刊
      郵發代號：-
    • 主管單位：中國船舶重工集團公司
      主辦單位：中國船舶重工集團公司第七0九研究所
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    計算機與數字工程 >2023年第2期

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    • 摘要：Describes a solution using the CPLD receives PPS, dual-port RAM address decoding and CPCI local bus communication hardware design, and gives the CPCI bus interface chip register configuration.%描述了一種使用CPLD解決秒脈沖接收、雙端口RAM地址譯碼和CPCI局部總線通信的硬件設計方案,并給出了CPCI總線接口芯片的寄存器配置.
    • 摘要：研究了步長對恒模算法(CMA)收斂性能的影響.調整步長至合適的值,使CMA算法性能達到總體最優,并對CMA算法進行改進.仿真結果表明,改進算法與CMA算法相比,收斂速度相近,穩態剩余誤差更小,從而解決了CMA算法收斂速度和穩態剩余誤差不能同時達到最小的問題.%The effect of step-size λ is studied on the convergence performance of constant modulus algorithm(CMA). λ is adjusted to an appropriate value so that CMA can achieve overall optimal performance. CMA is improved to achieve further optimal results. Simulation results indicate that the improved algorithm has a smaller steady-state residual error than CMA with the same convergence rate. The problem that neither the convergence rate nor the residual error of CMA cannot be minimized at the same time has been solved.
    • 摘要：蟻群優化算法應用于復雜問題的求解是非常耗時的.文章在MATLAB環境下實現了一個基于GPU+CPU的并行MAX-MIN蟻群系統,并將其應用于旅行商問題的求解.讓全部螞蟻共享一個偽隨機數矩陣,一個信息素矩陣,一個禁忌矩陣和一個概率矩陣,并運用了一個全新的基于這些矩陣的隨機選擇算法-AIR(All-In-Roulette).文章還介紹了如何使用這些矩陣來構造并行蟻群優化算法,并與相應串行算法進行了比較.計算結果表明新的并行算法比相應串行算法要高效很多.%Ant colony optimization is computationally expensive when it comes to complex problems. This paper presents and implements a parallel MAX-MIN Ant System(MMAS) based on a GPU＋CPU hardware platform under the MATLAB environment solve Traveling Salesman Problem(TSP). The key idea is to let all ants share only one pseudorandom number matrix, one pheromone matrix, one taboo matrix, and one probability matrix. A new selection approach based on those matrices, named AIR(All-In-Roulette) has been used. The main contribution of this paper is the description of how to design parallel MMAS based on those ideas and the comparison to the relevant sequential version. The computational results show that our parallel algorithm is much more efficient than the sequential version.
    • 摘要：GreenLab模型作為一個通用的植物生長模型,將植物的生理生態過程和形態結構的建模有機的結合到一起.文章以幼齡水杉為研究對象,基于GreenLab模型的源一匯機制構造了水杉的功能模型,基于雙尺度自動機原理構造了水杉的結構模型,并實現了水杉生長的可視化模擬.%GreenLab is a Functional Structural Plant Model (FSPM), which builds the plant morphogenesis using algorithms that simulate both the organs production (plant development) and the biomass production (plant growth). Water Chinese fir is the study object in this paper. We have constructed the functional model of Water Chinese fir based on the sourcesink mechanism of GreenLab model. We have constructed the structural model of Water Chinese fir based on the dual-scale automaton. It can simulate the growth of Water Chinese fir and output its three-dimensional view.
    • 摘要：現代制造業的生產模式向柔性制造和客戶化定制方向發展,為了提高制造系統的快速響應能力,實現快速仿真分析,提出基于數據驅動的建模與仿真方法,其具有建模周期短、模型可讀性、可重用性較高的特點.利用IDEFIX建模方法建立模型的底層數據結構,基于Arena構建仿真模型生成器,利用已建好的數據模型提供的屬性信息,自動生成目標系統的仿真模型.采用層次化建模方法將總裝線的管理和控制過程分解為不同層次,建立起詳細程度不同的仿真模型,將建模元素與仿真控制邏輯分離,使仿真的控制部分相對獨立.最后以某汽車生產企業的示例總裝線為例,設計數據驅動的建模方案和仿真運行邏輯,通過實驗驗證了該方法的可行性.%The production mode of modem manufacturing society transform to flexible manufacturing and customization. To improve the responsiveness of production system, a new approach based on data-driven modeling and simulation methodology is proposed, it can automatically generate the simulation model of production system and realize rapid modification. The generated model also has high efficiency, readability and reusability. The approach is developed for an automobile assembly line. Through the modeling approach of IDEF1X, a data structure of simulation model was constructed, a model simulator was implemented in Arena by VBA program, then a simulation model for target production system was built automatically through the attribute values in the data structure. The management and control process of assembly line is divided into different levels by hierarchical modeling approach, modeling element and control logic of simulation are separated. The case study of the automobile assembly line demonstrates the validity of data-driven modeling and simulation methodology.
    • 摘要：Crowd density estimation in public scene surveillance is an important issue of public security. A method of crowd density estimation based on image processing is presented. The number of people and the level of crowd density are estimated qualitatively and quantitatively combining methods of pixel statistics and texture analysis. To resolve the people number estimation of full scene, this paper divides the large scene into some needed small cells based on the proportion to estimate the density. Experimental results show that this method is simple, effective and practical in application. It also could provide powerful help to the public warming system, such as in airport , subway and station.%公共場景監控下的人群密度估計是公共安全管理中的一個重要內容,因此,對基于圖像處理的智能化人群密度估計方法進行了研究.結合使用像素統計和紋理分析的方法,從定性和定量兩個方面確定了人群人數和人群密度等級.針對大場景的人群密度監控情況,提出了根據實際場景在圖像中的比例將大場景分成所需的小區域,然后對每個子區域進行人群密度估計,從而完成全場景的人群密度估計.實驗結果表明這種方法簡單、有效、實用,便于在實際中的應用,為機場、地鐵、車站等公共場所的預警系統提供有力的幫助.
    • 摘要：Image registration is the core step for image mosaic. Color image registration using gradient histogram is implemented in this paper. The gradient histogram is formed from the gradient orientations of feature points within a region around the feature point. It describes the local feature better than the normal color histogram. These gradient orientation histograms are the basis of feature points matching, and we adopt histogram intersection as the similarity criterion. There are three key factors for gradient orientation histogram matching algorithm: window size, similarity threshold, and bins of gradient orientation histogram. We reveal the relationship between these factors and correct matching rate and execution time through a large number of experiments. And finally, we give the reasonable value ranges about these factors.%圖像配準是圖像拼接的核心環節.采用基于梯度直方圖的圖像配準算法進行彩色圖像的配準.梯度直方圖是通過計算以特征點為中心的一個矩形區域內所有像素的梯度而得到的.相比于彩色直方圖,它能更好的描述局部特征.梯度直方圖是特征點匹配的基礎,文中采用直方圖交叉作為相似性準則來衡量梯度直方圖間的相似性.基于梯度直方圖的匹配算法包含三個關鍵因素:窗口大小,相似性閾值以及梯度直方圖的柱數.本文通過大量的實驗揭示了這三個重要因素與匹配的正確率和匹配時間的變化關系.最后,給出了這三個因素的一個合理的取值參考范圍.
    • 摘要：This paper describes a kind of technique based on FPGA, which can be used on 16-bit CISC microprocessor systems of varieties of FPGA chips. With the top-down design method of VHDL, the CPU system is designed to execute 32 instructions which can achieve 5 categories of functions: mathematical and logical operations, the internal data transfer, data bit operations, logical judgement and jump, data input and output. Then, the simulation was successful in the Quartus Ⅱ 9. 0 integrated simulation environment. It was proved that the system can work well.%介紹了一種基于FPGA技術的16位CISC的微處理器系統的設計.該系統采用VHDL語言自頂向下的設計方法,可以完成算術和邏輯運算、數據內部傳輸、數據位操作、邏輯判斷與跳轉、數據輸入輸出共5大類,32條指令.在QuartusⅡ9.0中仿真成功,結果表明該CPU可以準確地完成各種指令組成的程序.
    • 摘要：To develop embedded Web server, the paper illustrates necessarily development environment and process of transplantationμClinux, the process of transplantation μClinux executes cuts and analysis research. Bootloader,μClinux kernel and read-only romfs file system burn to flash and μClinux kernel and root file system burning to Flash are described in detail.%以開發嵌入式Web服務器為目標,搭建了移植μClinux需要的開發環境和設計移植的流程,并對μClinux移植進行裁減和分析.bootloader、μClinux內核和只讀的romfs文件系統燒到Flash中的分析研究及μClinux內核和根文件系統的燒到Flash詳細過程描述.
    • 摘要：This article introduces the software design of a remote monitor system realized by VB 6. 0. Concrete method of realizing the telecommunication between PC and TC35i is discussed in detail. The procedure of serial communication is provided and the main programs to realize the serial communication are also presented. This system not only has good interface but also can be operated easily.%介紹利用VB開發完成遠程監控系統的軟件設計,重點介紹了用VB軟件實現PC機和TC3i之間通信的方法和具體通訊過程,給出了實現它們之間通訊的關鍵代碼.該系統具有良好的人機界面并且操作方便.
    • 摘要：文章提出一種具有非對稱結構的新型相變存儲器單元結構,并通過有限元方法對該非對稱結構相變存儲單元進行了三維電熱模擬.模擬結果表明,在相同的特征尺寸下,非對稱結構相變存儲單元的操作電流明顯小于傳統的對稱型T型結構相變存儲單元.%This paper proposes a novel asymmetric structure of PCRAM cell, and then conducts three dimensional electric-thermal simulations based on FEA(Finite Element Analysis) method.The simulation results show that, with the same feature size, the operation current of the PCRAM cell with asymmetric structure is lower than that of the cell with conventional symmetric T-type structure.
    • 摘要：In this paper, the primary thoughts and performance of some radio frequency identification ALOHA anti-collision algorithms are introduced concisely which are widely used currently. And then, the essential theory of dynamic frame slot ALOHA algorithm(DFSA) which estimates the number of the tags in the valid area of the reader indirectly and the frame size adjusting method are discussed in detail. It is also analyzed statistically for estimating the number of residual tags which are frequently adopted in the dynamic frame slot ALOHA algorithm. Finally, all the algorithms are simulated based on MatLab and the results indicate that DFSA algorithm estimating the number of residual tags indirectly can have the RFID system keep higher efficiency and identify the tags accurately in real-time.%簡要介紹了當前幾種主要的ALOHA算法基本思想和系統效能,詳細討論了間接估算自適應幀時隙(DFSA)算法的原理和幀長度調整方法,并就DFSA算法對未識讀標簽的估計方法進行了統計分析,最后基于MatLab對各種算法性能進行了仿真.結果表明,間接估算DFSA算法較其它算法更能使RFID系統保持較高的系統效率,能夠實時準確地識別標簽.
    • 摘要：This Paper focuses on the Web Log Mining and the association-rules mining algorithm-FP_Growth algorithm. The author puts forward a model on web personal information mining and applies it to the individualized service system in digital library called as "My Library". The system proposes the users' interesting rules of implicit profiling using the association-rules mining algorithm. Then the implicit interesting records are recommended to the users and accomplish the individualized service.%文章重點研究了Web日志挖掘以及關聯分析中的關聯規則挖掘算法FP_Growth算法,提出了一種改進的關聯規則挖掘算法,并將該算法應用于某高校圖書館個性化服務系統My Library的設計過程中,從服務器日志中得到用戶感興趣的隱式模式,并將該隱式興趣集推薦給用戶,從而在一定程度上實現了個性化服務.
    • 摘要：Variable swapping as the core of BDD optimization theory has been applied to reduce the size of BDD nodes,this paper from the standpoint of theory and practice of applying the theory to achieve the goal of reducing the number of BDD paths. By redefining the node reference field to achieve a record node path, analysis of variables in the swapping process to obtain the Changes in the amount of local path, introducing the dynamic list to complete recording and propagation of the node path, and eventually got the final path number of BDD node. The algorithm uses the C language completed, integrated into the CUDD package. Experiment result show correction and efficiency of the algorithm.%變量交換作為BDD優化算法的核心理論已成功運用于BDD節點規模的減少,本論文從理論和實踐的角度提出了運用該理論實現BDD路徑數量減少的目標.通過對節點引用域的重新定義來實現節點路徑的記錄,分析變量交換過程中本地節點重定向來獲取局部路徑的改變量,引入動態鏈表完成節點路徑增量的記錄和傳遞,最終在終節點得到了BDD的路徑數量.該算法用C語言完成,整合到CUDD軟件包,經多個函數的實驗測試,證實了這種路徑優化算法的正確、有效.
    • 摘要：In order to increase the objectivity of electro-optical combat effectiveness evaluation, an index system of effectiveness evaluation is set up, a RBF neural network is established. These test samples are used to train the RBF neural networks. At last, the RBF neural network is used to evaluate the combat effectiveness of electro-optical equipment, the result shows that the model of combat effectiveness evaluation of electro-optical equipment based on RBF neural network has advantages of practicability and feasibility.%為了提高光電裝備作戰效能評估的客觀性,在構建效能評估指標體系的基礎上,建立作戰效能評估RBF神經網絡模型,通過試驗數據樣本進行學習訓練RBF神經網絡模型.最后,利用訓練好的RBF神經網絡模型對光電裝備作戰效能進行評估,結果表明基于RBF神經網絡的光電裝備作戰效能評估模型具有一定實用性和可行性.
    • 摘要：Current urban traffic congestion is a serious problem, but the management system to the problem is generally not highly intelligent.A new traffic management system is designed.In the system, the technology of Intemet of things is used to record the congestion situation.This will generate vast amounts of data.The real-time database must be used to management these data.However, the decision-analysis, based on the mass data, is not efficient.A new interface has to be added.%目前城市交通擁堵的問題很嚴重,但管理的智能化水平普遍不高.為此設計了一個全新的交通管理系統,使用物聯網技術實時記錄路口的擁堵情況.這將產生海量的數據,必須使用實時數據庫來進行管理.但在決策分析時,基于海量數據的分析效率不高,需要在系統中增加新的接口.
    • 摘要：為了提高作戰效能評估的準確度,將粗糙集理論和神經網絡引入到作戰效能評估研究中,提出了粗糙集與神經網絡相結合的作戰效能評估方法.應用粗糙集簡化神經網絡訓練樣本數據集,在保留重要信息的前提下消除冗余的數據,仿真實驗表明評估精度提高了,并且能獲得更好的效果.以坦克作戰效能為例,構建了坦克的效能評估模型,給出了基于粗糙集和神經網絡相結合的方法對其進行效能評估的基本方法和步驟.%In order to improve the precision and feasibility of the evaluation of combat effectiveness, an evaluation method of combat effectiveness was applied based on rough set and BP neural network. The rough set reduce the training samples of neural network, and the study shows that rough set is effective and the overall accuracy greatly rises in the data table reduction while retaining key information. Through the tanks of combat effectiveness, a model for effectiveness evaluation is set up based on rough set and artificial neural network. This paper gives the basic methods and steps.
    • 摘要：By analyzing the existing traffic light control systems, an adaptive traffic light control system based on wireless sensor networks is proposed. The flow rate of vehicles is measured by using the wireless ultrasonic sensor nodes deployed on the road. The scheduling process of traffic lights is modeled and analyzed. An adaptive scheduling algorithm is presented, and simulation results show that this algorithm is able to reduce average waiting time of vehicles and improve traffic efficiency.%分析了現有信號燈控制系統的優缺點,提出了一種基于無線傳感器網絡的交通燈控制系統設計方案,利用敷設在路面上的攜帶超聲波收發模塊的傳感器節點探測各方向車道上車流量,并根據車流量實時改變相應車道車輛放行時間,以提高道路利用率,減少擁堵現象.本系統可準確地獲得車流量統計信息.對信號燈調度過程進行了建模分析,提出了自適應的調度算法,仿真實驗結果表明,該算法能降低車輛平均等待時間,提高通行效率.
    • 摘要：Course relationships, association rules and influence courses are figured out by the information of course score classifications, course selected-order evaluation and so on. And the potential relationships between courses are found by analyzing the real courses scores of the same specialty students and influence degree and the propositional course selected-orders are put forward. So the study guidance to students and course arrangement suggestions to teaching department could be provided by using simulation data for verification.%利用課程等級信息和選課次序評價信息等,挖掘課程之間的關聯關系,導出關聯規則,找出影響課程,分析影響度.利用仿真數據進行驗證,然后對某一屆同一專業全部學生全學年成績進行分析,挖掘實際數據中潛在的關聯規則,給出選課建議.
    • 摘要：Cross-realm client-to-client password-authenticated key exchange(C2C-PAKE) protocols are important in web communication. But most C2C-PAKE protocols can not resist password-compromise impersonation attack. This paper provides a new cross-realm C2C-PAKE protocol with signature scheme and low communication cost. Then the security of the protocal is proved under general model. The new protocol can be resistant to many attacks such as password-compromise impersonation attack and so on. Furthermore, this protocol provides the property of the perfect forward secrecy.%跨域客戶到客戶基于口令認證的密鑰交換(C2C-PAKE)協議具有重要的應用價值.但是,目前的大部分C2C-PAKE協議都無法抵抗口令泄露攻擊.該文給出了一個新的跨域客戶到客戶的口令認證密鑰交換協議.該協議帶有簽名體制且交互次數較少.隨后,在一般模型下對給出的協議進行了安全性證明.該協議可以抵抗口令泄露等各種攻擊,并且具有前向安全性質.
    • 摘要：介紹了一種基于GPRS模塊的遠程監控安防系統設計.該系統將微控制器ARM2410、紅外傳感器、攝像頭、溫度傳感器、GPRS模塊集成到一起,實現了異常情況自動監測、智能判斷以及短信報警等功能.該系統與傳統安防系統比較具有結構簡單,成本低廉,快速響應等優點,符合現代社會的需求.%This paper introduces a design of embedded system with infrared alarm and temperature alarm based on GPRS. The system kept microcontroller ARM2410, infrared sensor, camera, temperature sensor, GPRS modules together,realized the function of auto-detecting-mergence, intelligent judgment, alarming through SMS and so on. Comparing with traditional security system, the design had the advantages at simple structure, fast respose and low cost, and it fit for modern society demand.
    • 摘要：This paper proposes a new improved image scrambling algorithm based on gray transform.Firstly the algorithm does gray transform for original image, then Zig-Zag scan can be used, furthermore, making a bit-exclusive-or operation on each pixel with prior one, and the bits of each pixel value are exchanged across.thereby the ability of resisting decoding or attacking is improved again.The experimental results show that compared with some existing algorithms, the method not only provides with a scrambling image whose histogram has been changed obviously, but also the scrambled image look more like Gaussian noise, which is experted when being applied into the image encryption transmission or the preprocessing of secret images in digital watermarking.%文章提出了一種基于Gray變換的圖像置亂改進新算法,首先對原始圖像進行Gray變換,然后對變換后的圖像進行Zig-Zag掃描,再對每個像素值和它前面相鄰的像素值進行按位異或運算,同時對運算的結果進行像素值的交叉換位,提高抵抗破譯攻擊的能力.實驗結果表明,該算法與傳統的圖像置亂算法相比,置亂后的圖像不僅直方圖發生了顯著改變,而且置亂圖像的統計特征更像白噪聲,更加適用于圖像文件的加密傳輸和秘密圖像信息置亂預處理.
    • 摘要：Shadow mapping is the process of cast the shadows on the 3D curved surfaces which is widely used in 3D animation, but it usually suffers from aliasing. we use an intersection of frusta method based on trapezoidal shadow mapping technique to dispose anti-aliasing issue. The experiment result proves that this approach has a good overall control of the shadow map resolution and its smooth transition; it can also create high-quality shadows.%陰影映射是在三維計算機圖形中加入陰影的過程,在三維動畫中有廣泛的應用,但該算法容易產生走樣,使用一種基于梯形陰影映射的平截頭體交匯算法,對陰影映射進行了反走樣處理.實驗表明,該方法對于陰影映射分辨率和它們之間平滑過渡的總體能夠有很好的把握和控制,能夠生成高質量的陰影.
    • 摘要：Based on the characteristics of a Bezier curve, a trigonometric polynomial curve similar to three of Bezier curve is given: T-Bezier curve It has the characteristics similar to Bezier curve and can represent the quadratic curve precisely.%以Bezier曲線的特點為基礎,提出了一種新的類似于三次Bezier曲線的三角多項式曲線:T-Bezier曲線.該曲線具有Bezier曲線類似的性質且能夠精確地表示二次曲線.
    • 摘要：輪胎印痕識別對交通事故的現場勘測及事后偵查有著十分重要的作用.介紹了輪胎印痕識別在交通肇事逃逸案偵破中的具體應用,研究了基于FFT的圖像差值原理,提出了基于FFT圖像差值算法的輪胎印痕識別方法,并分析了具體的試驗數據,結果顯示,該方法有利于提高輪胎印痕識別的成功率,為快速查找肇事逃逸車輛提供了理論基礎和科學依據.%Tire imprint recognition has important role for the scene investigation and subsequent investigation in traffic accident. Introduced the specific application of tire imprint recognition in traffic incident and run case detection, studied on FFT image difference principle, proposed tire imprint recognition method based on FFT image difference algorithm, and analyzed specific test data, the result showed that, the method proposed the success rate in tire imprint, and provided theoretical basis and scientific basis for search escape vehicles.
    • 摘要：The common approach to implement Digital Modulator Carrier producing circuit on FPGA is based on a lookup table, which requires a huge volume of ROM to achieve high resolution. This paper porposes a pipelined architecture for implementation of digital modulator carrier on FPGA, which, based on CORDIC algorithm, can save considerable hardware resources and improve the speed performance as well. The system was implemented in EP1C12Q240C8, and the hardware practical test was done by embedded logic analyzer SignalTap Ⅱ of Quartus Ⅱ. The correctness and feasibility of this design is verified by practical test result.%數字調制器載波產生電路的FPGA實現通常都是基于查找表的方法,為了達到高精度要求,需要耗費大量的ROM資源去建立龐大的查找表.文中提出了一種基于流水線CORDIC算法的實現方案,可有效地節省FPGA的硬件資源,提高運算速度.電路在FPGA芯片EPIC12Q240C8上實現,并通過QuartusⅡ嵌入式邏輯分析儀SignalTapⅡ對硬件進行了實時測試,測試結果驗證了設計的正確性及可行性.
    • 摘要：為了利用物理聲學方法計算任意目標的散射聲場,基于VIJAYAKUMAR等人提出的求解奇異積分的方法提出了一種有效解決水聲問題中的奇異積分的新方法,并利用MATLAB編程進行了仿真計算,得到了標準剛性球前向散射聲場的回聲,并將全局法運用到了非齊次方程中,仿真結果表明,該方法計算精度較高,計算速度滿足工程需要.%In order to compute accoustic scattering of objects with aribitrary shape by Helmholtz-Kirchhoff Method,this paper introduced the golbal approach with high efficiency and simulate this approach bu MATLAB, then get forwardscattering results, simulation also indicate this method can get high efficiency and high speed in nonhomogeneous formulations.
    • 摘要：Search term used in information retrieval and word in the text may focus on the words do not match the text to affect information retrieval on this issue. According to the problems propose a new method of query expansion on the basic of context and global information. At the same time, the expansion terms are selected according to their relation with the whole query. Additionally, the position information between terms is considered. The results show that the method greatly improves average precision.%針對文本檢索中所使用的查詢詞可能與文本詞語不匹配而影響檢索效果這一問題,提出了一種基于上下文的查詢詞擴展的方法,該方法根據查詢詞出現的上下文信息進行擴展詞選擇,同時考慮到查詢擴展詞與整個查詢語句以及查詢詞的位置關系.實驗結果表明,該方法大大提高了平均查準率.
    • 摘要：The existing practical techniques in color image digital watermarking is lesser studied, especially for the embedding algorithm of grayscale watermarking signal, this paper proposes a new algorithm of 2-dimension DWT color image digital watermarking. The basic idea is first carries on 0,1 two values to the 2D barcode, then divides result into block, and carries on encoding to each block, finally organizes the picture which is formed by merging each sub-block according to specific arranged as the watermark. considering human visual system, we transform RGB space to YIQ space and embed watermark image into the low frequence of luminance Y of the color image by using discrete wavelet transform. The experiment show that the proposed method is better robust to adding noise, JPEG compression, low frequence filtering, mean frequence filtering,geomertic croping attack etal.%針對目前實用的彩色圖像數字水印技術不多,特別是灰度級水印信號的嵌入算法比較少,文章提出一種二維的DWT彩色圖像數字水印的新算法.基本思想是:選取二維條形碼作為嵌入的水印,在嵌入之前對其進行二值化,再對結果進行分塊并且對各個子塊進行編碼,最后將各個子塊合并后的圖像按照某種順序排列作為水印.考慮到人類的視覺系統(HVS)特點,我們采用YIQ色彩空間,將水印信號嵌入到載體圖像的亮度分量Y的DWT后的低頻系數上.實驗結果證明該算法對加噪,JPEG壓縮,低通濾波,中值濾波,幾何剪切等攻擊具有很好的魯棒性.
    • 摘要：For a single clustering algorithm for image segmentation is easy to fall into local optimum or the phenomenon of over-segmentation, which will result in low accuracy problem of segmentation, We put forward a new clustering algorithm combining ant colony clustering with K-means algorithm. The new clustering algorithm is the first K-means algorithm for rapid classification, and according to classification results update the pheromones to guide the choosen of other ants, to improve the efficiency of ant colony clustering algorithm. Experimental results show that the new algorithm for image segmentation accuracy than a single K means clustering algorithm and the ant colony clustering algorithm has greatly improved.Therefore, further show that this method for image segmentation has good versatility and effectiveness, is a practical and promising method of image segmentation.%針對單一聚類算法在圖像分割中容易陷人局部最優或有過分割現象,造成分割精確度低等問題,文章提出了基于K-均值聚類和蟻群聚類相結合的新算法.新算法先將K-均值算法作快速分類,根據K-均值分類結果更新螞蟻各路徑上的信息素,指導其他螞蟻選擇,以提高蟻群聚類算法的運行效率.實驗結果證明,新算法在圖像分割處理的精確度上較單一的K均值和蟻群聚類算法有很大提高.所以進一步表明該方法對于圖像分割具有很好的通用性和有效性,是一種實用的、有前途的圖像分割方法.

      計算機與數字工程的期刊信息

      • 曾用名：計算機雜志
      • 創刊時間：1973
      • 地區：CN
      • 語言：中文
      • 熱門主題：中國船舶重工集團公司第七0九研究所
      • 學科分類：

      計算機與數字工程的獲獎情況

      計算機與數字工程的收錄情況

      • ? 中國科技核心期刊

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      • 郵編：430205
      • 聯系電話：027-87534308 87534205
      • 郵箱：[email protected]；[email protected]
      • 期刊欄目：算法分析；信息融合；系統機構；信息處理與網絡安全；圖像處理；工程實踐

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